RCF MQ 50 Bedienungsanleitung Seite 5

To prevent the risk of electric shock, do not connect the speaker
with the amplifier switched on.
Before using the speaker, carefully check that all the connections have been
made correctly to make sure there are no accidental short circuits that could
cause electrical sparks. The speaker can be connected to constant voltage
audio lines at 70 V or 100 V or to constant impedance lines (rotary switch
positioned to 16 Ohm).
1. Turn the rotary switch (Fig. 1) and select the voltage of the line and the
power to be delivered.
2. Connect the black conductor of the speaker to the "negative" (-) of the
audio line, that leads from the amplifier terminal marked -, 0 or COM tap
of the amplifier
3. Connect the other conductor of the speaker to the "positive" (+) conductor
of the audio line.
4. When making the connections, keep the following indications in mind
(Fig. 2, costant voltage).
- The input voltage selected on the speaker must correspond with the voltage
selected on the amplifier.
- The sum of the operating power values of all the speakers connected to the
audio line must not exceed that of the amplifier.
- To ensure correct audio reproduction, the connections should be made "in
phase", where the +/- polarities of the amplifier output correspond with the
+/- polarities of the speaker input.
When two speakers reproduce the same frequencies but with phase differences,
these frequencies may be annulled. In sound systems, speakers are often
situated in adjacent positions and the sound waves produced interact with
each other. If a speaker is connected incorrectly; i.e. the polarity of the audio
line conductors is inverted, the audio signals are transmitted with differences
in phase and correct reproduction is therefore jeopardized.
Fig. 2
Amplifier
Pa > Pd x n
Pa = Amplifier power
Pd = Speaker power
n = Number of speakers
Vd = Speaker input voltage
Va = Amplifier output voltage
+
-
Va
- -
+
Vd = Va Vd = Va
CONNECTIONS
Fig. 1
-
+ +
Vd = Va
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